Aside from your home address, the field doesn't validate data input for practical correctness. This is important because t-mobile forces you to consent to marke

Aside from your home address, the field doesn't validate data input for practical correctness. This is important because t-mobile forces you to consent to marketing in order to find out availability, but you can still check for rough availability with garbage information (incl. an e.g. 1-nnn-555-nnnn number and a mailinator or equally disposable email address) and an address near you, ideally an address that's an empty lot or nonexistent/halfway between homes. It's also why I flagged the post -- t-mobile is seeking marketing opt-ins with this effort, and that's about it. A genuine lookup service wouldn't force opt-in consent in this manner.